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Reduced-area architecture for padded-protocol interface

a technology of padded information and interface, applied in the field of circuitry, can solve problems such as the challenge of serial communication of padded information

Inactive Publication Date: 2007-07-03
ALTERA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]The present invention includes a data receiver incorporating a padded protocol converter based on a state machine that requires the buffering of only one sample in addition to the sample being decoded. The invention is based on a trade-off between area and speed. At some point in the operation of the state machine in the converter according to the invention, the next sample becomes the current sample, and the third sample (the sample following the next sample) becomes the next sample. In accordance with the invention, the state machine of the converter waits one additional clock cycle until the following sample becomes available by virtue of having become the next sample. The converter is therefore made smaller by eliminating the need to buffer the third sample.

Problems solved by technology

Serial communication of padded information can be a challenge because of possibly complicated clocking issues.

Method used

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  • Reduced-area architecture for padded-protocol interface
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  • Reduced-area architecture for padded-protocol interface

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Embodiment Construction

[0018]A previously known data converter 10 in accordance with the aforementioned IEEE standard, and its state machine, are shown in FIGS. 1 and 2. As seen in FIG. 1, the encoded or padded data to be decoded (after reception and processing through a gearbox as described above) move along the lower signal path 11, while control signals move along the upper signal paths 12, 13.

[0019]In a first clock cycle, a first group or sample of padded data arrives at 100, where it is stored in buffer 101, and also directed to combinatorial function 15 where data type information 150 needed for decoding is derived. In a steady state, data type information 150 is used in state machine 16 with other data type information from previous samples to direct the operation of decoder 17. However, if the system has just been started, nothing will be done with these data or data type information.

[0020]In a second clock cycle, the first sample arrives at 102 and is stored in buffer 103, and in addition is dire...

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PUM

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Abstract

A data converter for a padded protocol interface performs, on a first data sample, decoding operations requiring data from second and third data samples, while buffering the second data sample without buffering the third data sample. A state machine controlling the decoding operation waits an additional clock cycle, until the second sample has become the current sample and the third sample has become the second sample and thus is available.

Description

BACKGROUND OF THE INVENTION[0001]This invention relates to circuitry for handling communication of digital information to which bits are added periodically for synchronization or the like, and more particularly to an interface having reduced area as compared to previously known such interfaces.[0002]A communication protocol that is increasingly of interest is known as “64b / 66b encoding.” This is a protocol in which 64 bits of data are scrambled (e.g., to achieve balance between the number of binary ones and the numbers of binary zeros that need to be transmitted so that there is no net direct current in the transmission) and two additional bits having one or more particular sequences are transmitted with each 64 bits as synchronization information. Thus for every 64 bits of information that need to be sent, 64 information bits and two SYNC bits are transmitted. The SYNC bits may be the sequence “10” or “01”. Extra bits of this kind may sometimes be referred to herein as “padding.” A...

Claims

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Application Information

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IPC IPC(8): G06F3/00H03M7/00H03M7/04G06F13/12G06F13/16G06F13/38
CPCH03M5/145H04L25/4908
Inventor XUE, NING
Owner ALTERA CORP